added RSA decode script

TAMUCTF/Crypto/RSAaaay/decodrsa.py

@@ -0,0 +1,22 @@
+from Crypto.Util.number import inverse
+from fractions import *
+
+e = 43
+n = 2531257
+c = "906851 991083 1780304 2380434 438490 356019 921472 822283 817856 556932 2102538 2501908 2211404 991083 1562919 38268"
+c = c.split(" ")
+c = map(int, c)
+p = 509
+q = 4973
+phi = (p - 1) * (q - 1)
+d = inverse(e, phi)
+m = []
+for i in c:
+	m.append(pow(i, d, n))
+print  m
+
+plain = [103, 105, 103, 101, 109, 123, 83, 97, 118, 97, 103, 101, 95, 83, 105, 120, 95, 70, 108, 121, 105, 110, 103, 95, 84, 105, 103, 101, 114, 115, 125]
+flag = ""
+for i in plain:
+	flag += chr(i)
+print "Decoded flag : ", flag